EMBRAER 120 Fuel System

EMBRAER 120 Fuel System

GENERAL DESCRIPTION The fuel system supplies fuel at flow and pressure rates as required for the engine and APU operation. The fuel is contained in wing tanks. Each wing has two independent integral tanks, namely the outboard tank and the inboard tank, which are separated by the main landing gear wheelwell and interconnected by tubes for gravity fuel transfer. The inboard tank has a subdivision named collector tank, which is located in the lowest region of the inboard tank and houses the fuel pumps. CAPACITY The following figures represent the amount of usable and unusable fuel: Usable Fuel (each wing) Gallons/Pounds* Liters/Kilograms** 441/2955 1670/1340 Unusable Fuel (each wing) Gallons/Pounds* * Fuel density = 6.7 pound per gallon. ** Fuel density = 0.8029 kilograms per liter. Liters/Kilograms** 3.7/24.8 14/11.2 6-5-2 Page 1

SYSTEMS DESCRIPTION FUEL TANK Page 2 6-5-3

FUEL FEED SYSTEM FUEL PUMPS Each fuel tank has a main jet fuel pump and two electric fuel booster pumps installed in the collector tank. They are responsible for feeding fuel to the engine and APU. In addition, each tank has two scavenger pumps located in the inboard tank which are responsible for supplying fuel to the collector tank. The main jet pump is capable of supplying the required fuel to the engine and APU, except during start, crossfeed operation, or when the APU is on and the right engine is inoperative. The electric booster pumps are identified as FRONT and REAR on the fuel panel. FIREWALL SHUTOFF VALVE The firewall shutoff valve is commaned through the corresponding fire-extinguishing handle. When actuated, it cuts fuel supply to the associated engine. FUEL CROSSFEED SHUTOFF VALVE The engine fuel manifolds are interconnected with the use of the crossfeed valve. The valve provides a means of directing fuel to both engines from any tank. 6-5-4 Page 3

SYSTEMS DESCRIPTION FUEL FEED SCHEMATIC Page 4 6-5-5/(6-5-6 blank)

SYSTEMS DESCRIPTION FUEL FEED PANEL (OVERHEAD PANEL) Page 5 6-5-7

PRESSURE REFUELING/DEFUELING Pressure refueling and defueling are accomplished at the fueling panel, located on the right wing underside. Refueling operation may be accomplished with the airplane either energized or not. When the airplane is energized, the system operation will be enabled: By selecting the MAN position of the REFUELING MASTER switch and the OPEN position of the SHUTOFF VALVE switch or; By selecting the AUTO position of the REFUELING MASTER switch and by setting the bug of the quantity indicators. CAUTION: PRESSURE REFUELING WITH THE AIRPLANE BUSES DEENERGIZED IS NOT RECOMMENDED, SINCE NO INDICATION WILL BE AVAILABLE ON THE FUEL- ING PANEL. IN THE EVENT OF ANY VENT VALVE FAILURE IN THE CLOSED POSITION, STRUCTURAL DAMAGE TO THE WING MAY OCCUR. The defueling is performed by using the same adapter as used in the refueling system. Fuel tanks are defueled by means of the electric booster pumps via electrically-operated defuel valves which are controlled from the fueling panel. Suction pressure, from a ground equipment, up to 0.5 psig, may be applied to the adapter to increase the defueling flow rate. For detailed defueling instructions, see Maintenance Manual. GRAVITY REFUELING/DEFUELING Gravity refueling is accomplished through a filler cap at the wing upper surface. Manual defueling is accomplished through a dump valve installed on the lower surface of each inboard tank. 6-5-8 Page 6

SYSTEMS DESCRIPTION REFUELING/DEFUELING SYSTEM SCHEMATIC Page 7 6-5-9/(6-5-10 blank)

SYSTEMS DESCRIPTION FUELING PANEL (RIGHT UNDERWING) Page 8 6-5-11

FUEL MANAGEMENT PANEL FUEL TOTALIZER Provides either total fuel used or fuel remaining indications. The desired function is obtained by pressing the FCTN button. The alphanumeric display will alternate between FU (fuel used) or FR (fuel remaining) each time the button is pressed. The corresponding quantity is shown on the numeric display (the last digit is fixed at zero). To reset the total fuel used, FU function must be selected and, while the alpha display shows FU, the fuel used register can be reset to zero by pulling the PULL TO SET knob. This knob must be held pulled out for at least three seconds. When the alpha display is in FR, the fuel remaining register can be initialized by pulling the PULL TO SET knob. The initial value is set equal to the total fuel quantity instrument indication. The knob must be held at least three seconds. Manual fuel remaining reading adjustment can be accomplished by rotating the PULL TO SET knob from its mid position. Clockwise rotation will increase the value and counterclockwise rotation will decrease the value. The display change rate is determined by how far the knob is rotated. To prevent improper readings due to power transients or memory error, a check-sum test is constantly made. If an error is detected, the display will show ER. In order to reset the error condition, the FCTN button must be pressed. Alpha display will show then FR, and the numeric display will show "0000". After an error is reset, the system must be initialized again to show proper reading. Alpha and numeric indication is blank for power or signal loss. ENGINE No. 1 AND No. 2 FUEL FLOW INDICATORS Analogically and digitally indicate the fuel flow mass, in pounds (or kilograms) per hour. The left fuel flow indicator is connected to DC bus 1 and the right fuel flow to DC bus 2. If a DC bus fails, the respective fuel flow indicator will be inoperative. LEFT AND RIGHT TANK FUEL QUANTITY INDICATORS Indicate the remaining usable fuel quantity in the tank. Pressing the test button in the refueling/ defueling panel will cause the cockpit fuel quantity indicators to rotate clockwise to full scale. The left fuel quantity indicator is connected to DC bus 1 and the right fuel quantity is connected to DC bus 2. In the case of a DC bus failure, the fuel quantity indicator will be inoperative. CROSS FEED OPEN INDICATOR LIGHT The CROSS FEED OPEN white light on the fuel management panel, and the white OPEN light, on the fuel feed panel, indicate when the crossfeed valve is fully open. 6-5-12 Page 9

SYSTEMS DESCRIPTION FUEL MANAGEMENT PANEL (FORWARD PANEL) Page 10 6-5-13

DIRECT QUANTITY MEASURING SYSTEM (DRIPLESS STICK) The aircraft is equipped with a direct quantity measuring system, comprising four measuring points located under the wing. Each measuring point is provided with a magnetic float, which holds a calibrated stick. When it reaches the fuel level, the stick provides a visual check of the fuel quantity in each wing. To determine the usable fuel quantity in one of the wings, it is advisable to start at point No. 4 (wing tip) and proceed in the direction of the wing root until reaching the most outboard point which is not at the lower stop (zero reading). For a correct reading, press and turn the stick, allowing it to lower smoothly until the stick is held by the magnetic float. Next, enter the value indicated on the scale in the Direct Measuring System Table. Two sets of tables are presented: one in US Gallon and pound, and the other in liter and kilogram. Fuel quantity readings should be performed with the aircraft laterally leveled, as checked through the ADI inclinometer. 6-5-14 Page 11

SYSTEMS DESCRIPTION DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 NOTE: The accuracy for U.S. readings is ± 2.6 U.S. Gal. The values in pounds are valid for fuel densities between 6.68 and 6.84 lb/u.s. Gal. In this case the reading accuracy is ± 44 lb. For fuel densities out of this range, multiply the volume in U.S. Gal by the actual fuel density to find the mass in pounds. STICK INDICATION 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 US Gal pound US Gal pound US Gal pound US Gal pound 62. 63. 64. 65. 66. 67. 68. 69. 70. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. 83. 84. 85. 86. 87. 88. 89. 90. 91. 418. 425. 433. 440. 448. 455. 462. 470. 477. 485. 492. 500. 507. 515. 522. 530. 537. 544. 552. 559. 567. 574. 582. 589. 597. 604. 612. 619. 133. 135. 136. 137. 138. 139. 140. 141. 142. 143. 144. 145. 146. 147. 148. 149. 150. 151. 152. 153. 154. 155. 156. 157. 158. 159. 160. 161. 904. 911. 918. 925. 932. 940. 947. 954. 961. 968. 975. 982. 989. 996. 1003. 1010. 1017. 1024. 1031. 1038. 1045. 1052. 1059. 1066. 1073. 1080. 1087. 1094. 191. 193. 194. 195. 197. 198. 199. 200. 202. 203. 204. 206. 207. 208. 210. 211. 212. 213. 215. 216. 217. 219. 220. 221. 222. 224. 225. 226. 1296. 1305. 1314. 1323. 1332. 1340. 1349. 1358. 1367. 1376. 1384. 1393. 1402. 1411. 1420. 1428. 1437. 1446. 1455. 1464. 1472. 1481. 1490. 1499. 1508. 1516. 1525. 1534. 257. 258. 259. 261. 262. 263. 265. 266. 267. 269. 270. 272. 273. 274. 276. 277. 278. 280. 281. 282. 284. 285. 287. 288. 289. 291. 292. 293. 1738. 1747. 1757. 1766. 1775. 1784. 1794. 1803. 1812. 1821. 1831. 1840. 1849. 1858. 1868. 1877. 1886. 1895. 1905. 1914. 1923. 1932. 1942. 1951. 1960. 1969. 1979. 1988. Page 12 6-5-15

DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 STICK INDICATION 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 6.1 6.2 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 US Gal pound US Gal pound US Gal pound US Gal pound 92. 94. 95. 96. 97. 98. 99. 100. 101. 102. 103. 105. 106. 107. 108. 109. 110. 111. 112. 113. 114. 116. 117. 118. 119. 120. 121. 122. 123. 124. 125. 127. 128. 129. 627. 634. 641. 649. 656. 664. 671. 679. 686. 694. 701. 709. 716. 723. 731. 738. 746. 753. 761. 768. 776. 783. 791. 798. 806. 813. 820. 828. 835. 843. 850. 858. 865. 873. 162. 164. 165. 166. 167. 168. 169. 170. 171. 172. 173. 174. 175. 176. 177. 178. 179. 180. 181. 182. 183. 184. 185. 186. 187. 188. 189. 190. 191. 193. 194. 195. 196. 197. 1101. 1108. 1115. 1122. 1129. 1136. 1143. 1150. 1157. 1164. 1171. 1178. 1185. 1192. 1199. 1206. 1213. 1220. 1227. 1234. 1241. 1248. 1255. 1262. 1269. 1276. 1283. 1290. 1297. 1304. 1312. 1319. 1326. 1333. 228. 229. 230. 232. 233. 234. 235. 237. 238. 239. 241. 242. 243. 245. 246. 247. 248. 250. 251. 252. 254. 255. 256. 258. 259. 260. 261. 263. 264. 265. 267. 268. 269. 271. 1543. 1552. 1560. 1569. 1578. 1587. 1595. 1604. 1613. 1622. 1631. 1639. 1648. 1657. 1666. 1675. 1683. 1692. 1701. 1710. 1719. 1727. 1736. 1745. 1754. 1763. 1771. 1780. 1789. 1798. 1807. 1815. 1824. 1833. 295. 296. 297. 299. 300. 302. 303. 304. 306. 307. 308. 310. 311. 312. 314. 315. 317. 318. 319. 321. 322. 323. 325. 326. 327. 329. 330. 1997. 2006. 2016. 2025. 2034. 2043. 2053. 2062. 2071. 2080. 2090. 2099. 2108. 2117. 2127. 2136. 2145. 2154. 2164. 2173. 2182. 2191. 2201. 2210. 2219. 2228. 2238. 6-5-16 Page 13

DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 STICK INDICATION 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9.0 9.1 9.2 9.3 9.4 9.5 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 US Gal pound US Gal pound US Gal pound US Gal pound 130. 131. 132. 133. 134. 135. 136. 138. 139. 140. 141. 142. 143. 144. 145. 146. 147. 149. 150. 151. 152. 153. 154. 155. 156. 157. 159. 160. 161. 162. 163. 164. 165. 880. 888. 895. 902. 910. 917. 925. 932. 940. 947. 955. 962. 970. 977. 985. 992. 999. 1007. 1014. 1022. 1029. 1037. 1044. 1052. 1059. 1067. 1074. 1081. 1089. 1096. 1104. 1111. 1119. 198. 199. 200. 201. 202. 203. 204. 205. 206. 207. 208. 209. 210. 1340. 1347. 1354. 1361. 1368. 1375. 1382. 1389. 1396. 1403. 1410. 1417. 1424. 272. 273. 274. 1842. 1851. 1859. Page 14 6-5-17

DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 NOTE: Assumed fuel density: 0.785 kg/l. For other fuel densities, multiply the volume in liters by the actual fuel density, to find the mass in kilograms. STICK INDICATION 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 LITER KG LITER KG LITER KG LITER KG 233 238 242 246 250 254 258 263 267 271 275 279 283 288 292 296 300 304 308 312 317 321 325 329 333 337 342 346 350 183 187 190 193 196 199 203 206 209 212 215 219 222 226 229 232 236 239 242 245 249 252 255 258 261 265 268 272 275 505 509 513 517 521 525 529 533 537 541 544 548 552 556 560 564 568 572 576 580 584 588 592 595 599 603 607 611 615 396 399 403 406 409 412 415 418 421 425 427 430 433 436 440 443 446 449 452 455 458 462 465 467 470 473 476 480 483 724 729 734 739 744 749 754 759 764 768 773 778 783 788 793 798 803 808 813 818 823 827 832 837 842 847 852 857 862 568 572 576 580 584 588 592 596 600 603 607 611 615 619 623 626 630 634 638 642 646 649 653 657 661 665 669 673 677 971 976 981 986 992 997 1002 1007 1012 1017 1023 1028 1033 1038 1043 1048 1054 1059 1064 1069 1047 1080 1085 1090 1095 1100 1105 1111 1116 762 766 770 774 779 783 787 790 794 798 803 807 811 815 819 823 827 831 835 839 843 848 852 856 860 864 867 872 876 6-5-18 Page 15

DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 STICK INDICATION 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 6.1 6.2 6.3 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 LITER KG LITER KG LITER KG LITER KG 354 358 362 367 371 375 379 383 387 392 396 400 404 408 413 417 421 425 429 433 438 442 446 450 454 458 463 467 471 475 479 483 488 492 278 281 284 288 291 294 298 301 304 308 311 314 317 320 324 327 330 334 337 340 344 347 350 353 356 360 363 367 370 373 376 379 383 386 619 623 627 631 635 639 642 646 650 654 658 662 666 670 674 678 682 686 690 693 697 701 705 709 713 717 721 725 729 733 737 741 744 748 486 489 492 495 498 502 504 507 510 513 517 520 523 526 529 532 535 539 542 544 547 550 553 557 560 563 566 569 572 575 579 582 584 587 867 872 877 881 886 891 896 901 906 911 916 921 926 931 936 940 945 950 955 960 965 970 975 980 985 990 995 999 1004 1009 1014 1019 1024 1029 681 685 688 692 696 699 703 707 711 715 719 723 727 731 735 738 742 746 750 754 758 761 765 769 773 777 781 784 788 792 796 800 804 808 1121 1126 1131 1136 1142 1147 1152 1157 1162 1167 1173 1178 1183 1188 1193 1198 1204 1208 1214 1219 1224 1229 1235 1240 1245 1250 880 884 888 892 896 900 904 908 912 916 921 925 929 933 937 940 945 948 953 957 961 965 969 973 977 981 Page 16 6-5-19

DIRECT MEASURING SYSTEM TABLE (Roll: 0 ; Pitch: 0 + 2 ) 2 STICK INDICATION 6.4 6.5 6.6 6.7 6.8 6.9 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9.0 9.1 9.2 9.3 9.4 9.5 STICK FUEL QUANTITY (USABLE) STICK 1 STICK 2 STICK 3 STICK 4 LITER KG LITER KG LITER KG LITER KG 496 500 504 508 513 517 521 525 529 533 538 542 546 550 554 558 563 567 571 575 579 583 588 592 596 600 604 608 613 617 621 625 389 393 396 399 403 406 409 412 415 418 422 425 429 432 435 438 442 445 448 451 455 458 462 465 468 471 474 477 481 484 487 491 752 756 760 764 768 772 776 780 784 788 791 795 590 593 597 600 603 606 609 612 615 619 621 624 1034 1039 812 816 6-5-20 Page 17